THE SPIDER CRABS OF AMERICA 469 



Description. — Differs as follows from typical trispinosum: The 

 shape of the carapace is different because the carapace is very little, 

 if at all, constricted behind the orbits; the projections at the postero- 

 lateral angles are scarcely spines, but broad, obtuse, laminate lobes 

 whose margins are almost continuous with those of the carapace 

 proper; the posterior median spine is short and blunt. The emargi- 

 nation in the upper border of the orbit is slight, the preocular tooth 

 acute, not prominent, the postocular tooth blunt or subacute. The 

 four bosses in the middle of the carapace are smootlily rounded. 



Measurements. — Male (15137), extreme length of carapace 52, ex- 

 treme width of same 49.4 mm. 



Color. — Yellowish (Desbonne). When cleaned, reddish brown 

 (Verrill). 



Range. — North Carolina; Florida Keys; Gulf of Mexico; West 

 Indies; Fernando Noronha Island, Brazil; Bermudas. Shore to 26 

 fathoms. 



Material examined. — See table, pages 471-472. 



MACROCOELOMA CAMPTOCERUM (Stimpson) 



Plate 174, fig. 4; plate 270, fig. 2 



Pericera camptocera Stimpson, Bull. Mus. Comp. Zool., vol. 2, 1871, p. 112 



(type-locality, near Key West in from 2 to 5 fathoms; type not extant). — 



A. Milne Edwards, Crust. Reg. Mex., 1873, p. 57. 

 Macrocoeloma camptocera Miers, Challenger Rept., Zool., vol. 17, 1886, pp. 



79 and 80.— Rathbun, Proc. U. S. Nat. Mus., vol. 15, 1892, p. 249, pi. 33, 



fig. 2. 

 Macrocoeloma camptocerum Rathbun, Bull. Lab. Nat. Hist. State Univ. 



Iowa, vol. 4, 1898, p. 257. 



Diagnosis. — Rostral horns divergent from base. Postero-lateral 

 spines slender. Four dorsal spines present. 



Description. — Surface covered with a short, close pubescence, and 

 in addition, longer curved hairs are present on the front, gastric 

 region, and lateral portions of branchial regions. Postero-lateral 

 spines subconical, regularly tapering, acute, and directed slightly 

 backward. Posterior median spine shorter, acute, obliquely erect. 

 Four slender, erect, dorsal spines forming a cross, one gastric, one 

 cardiac, two branchial. Rostral horns rather regularly divergent 

 from their base, acute. The antennae may overreach the horns; the 

 antennal spines, right and left, are very divergent from each other. 

 The orbital tubes are laterally very protuberant as are also the little 

 anterior and posterior spines, the former curving forward a little. 



Chelipeds of male strong, longer than carapace; the arms have a 

 few short spinules above, tUe wrists are a little nodulous and have a 

 tubercle at the inner angle; the palm is widest near the articula- 

 tions, the fingers are tipped with black or dark brown. Legs slender, 

 nearly smooth. 



5487— 25t 32 



